Journal of Ecology and Environment

한국생태학회 (The Ecological Society of Korea)
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Effects of Pinus densiflora on soil chemical and microbial properties in Pb-contaminated forest soil

  • Kim, Sung-Hyun (School of Civil and Environmental Engineering, Yonsei University) ;
  • Lee, In-Sook (Division of EcoScience, Ewha Womans University) ;
  • Kang, Ho-Jeong (School of Civil and Environmental Engineering, Yonsei University)
  • 투고 : 2011.06.21
  • 심사 : 2011.07.08
  • 발행 : 2011.09.01
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초록

We investigated the effect of Pb uptake by Pinus densiflora and the Pb fraction in forest soil. We also investigated the change in soil physicochemical characteristics, microbial activity, and root exudates of Pinus densiflora in Pb-contaminated soils. Three-year-old pine seedlings were exposed to 500 mg/kg Pb for 12 months. The metal fractions were measured using sequential extraction procedures. Additionally, factors that affect solubility (three soil enzyme activities and amino acids of root exudate compounds) were also determined. The results showed that Pb contamination significantly decreased enzyme activities due to soil characteristics. In addition, organic matter, nitrate content, and Pb concentration were time dependent. The results indicate that changes in the Pb fraction affected Pb uptake by pine trees due to an increase in the exchangeable Pb fraction. The concentrations of organic acids were higher in Pb-spiked soil than those in control soil. Higher rhizosphere concentrations of oxalic acid resulted in increased Pb uptake from the soil. These results suggest that pine trees can change soil properties using root exudates due to differences in the metal fraction.

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